<template>

  <div class="category">

    <!-- 显示所有上架的父分类 -->
    <ul>
      <li @click="selectFirstCategory({})" :class="{active: !firstCategorySelected.id}">全部</li>
      <li v-for="(category, index) in firstCategoryList"
          :key="index"
          :class="{active: category.id == firstCategorySelected.id}"
          @click="selectFirstCategory(category)">{{ category.name }}
      </li>
    </ul>

    <!-- 显示父分类下的子分类 -->
    <ul v-if="firstCategorySelected.id">
      <li @click="selectSecondCategory({})" :class="{active: !secondCategorySelected.id}">全部</li>
      <li v-for="(category, index) in secondCategoryList"
          :key="index"
          :class="{active: category.id == secondCategorySelected.id}"
          @click="selectSecondCategory(category)">{{ category.name }}
      </li>
    </ul>

  </div>

  <!-- 显示搜素到的商品 -->
  <div class="goodsList">
    <ul>
      <li v-for="(goods, index) in pageInfo.list" :key="index" @click="toGoodsView(goods.id)">
        <div class="pic">
          <el-image :src="`${SERVER_ADDR}/goods/pic/${goods.picList[0].url}`"
                    style="width: 200px; height: 200px; margin-top: 10px" fit="contain"/>
        </div>
        <div class="name">{{ goods.name }}</div>
        <div class="dscp">{{ goods.dscp }}</div>
        <div class="price">￥ {{ goods.price }}</div>
      </li>
    </ul>
    <el-row class="row-bg" justify="center">
      <el-pagination style="margin-top: 20px;" background layout="prev, pager, next"
                     v-model:current-page="pageInfo.pageNum"
                     :page-count="pageInfo.pages"
                     @update:current-page="search"/>
    </el-row>
  </div>


</template>

<script setup>
import {ref, watch} from "vue";
import categoryApi from "@/api/categoryApi.js";
import goodsApi from "@/api/goodsApi.js";
import {useRouter} from "vue-router";
import {useGoodsStore} from "@/stores/goods.js";

const goodsStore = useGoodsStore();

const router = useRouter();

//服务器地址
const SERVER_ADDR = ref(import.meta.env.VITE_SERVER_ADDR);

//获取通过路径传递的参数
const props = defineProps({
  categoryId: String
});

//所有需要显示的父分类
const firstCategoryList = ref([]);

//所有需要显示的子分类
const secondCategoryList = ref([]);

//被选中的父分类
const firstCategorySelected = ref({});

//被选中的子分类
const secondCategorySelected = ref({});

//被选中的分类id - 可能是父分类，也可能是子分类
const categoryId = ref(null);

//通过路径传递的参数发生变化进行的处理
watch(props, () => {
  getParent();
});

//点击父分类调用的函数
function selectFirstCategory(category) {
  //给选中的父分类赋值
  firstCategorySelected.value = category;

  //只要选择某个父分类，就要清空所有要显示的子分类
  secondCategoryList.value = [];

  //给被选中的id赋值
  if (firstCategorySelected.value.id) {
    categoryId.value = firstCategorySelected.value.id;
  } else {
    categoryId.value = null;
  }

  //给被选中的父分类下的子分类赋值
  if (category.childList) {
    // secondCategoryList.value = category.chidList;
    category.childList
        .filter(c => c.status == 0)
        .forEach(c => secondCategoryList.value.push(c));
  }

  //查询商品
  search(1);
}

//点击子分类调用的函数
function selectSecondCategory(category) {
  //给选中的子分类赋值
  secondCategorySelected.value = category;

  //给被选中的id赋值
  if (secondCategorySelected.value.id) {
    categoryId.value = secondCategorySelected.value.id;
  } else {
    categoryId.value = firstCategorySelected.value.id;
  }
  //查询商品
  search(1);
}

//获取父分类 1.上架 2.推荐
function getParent() {
  const condition = {
    parentId: 0,
    recom: 0,
    status: 1
  };
  categoryApi.selectByPage(condition)
      .then(resp => {
        firstCategoryList.value = resp.data;
        //假设没有通过路径传递参数或者传递的id在父分类中不存在
        let flag = true;
        firstCategoryList.value.forEach(c => {
          if (props.categoryId == c.id) {
            flag = false;
            selectFirstCategory(c)
          }
        });
        //假设成立
        if (flag == true) {
          //父分类选择全部
          selectFirstCategory({});
        }
      });
}

//分页信息
const pageInfo = ref({
  pages: 0,
  pageSize: 0,
  pageNum: 0
});

//搜素
function search(pageNum) {
  const condition = {
    name: goodsStore.goodsInfo,
    status: 0,
    categoryId: categoryId.value,
  };
  console.log(condition);
  goodsApi.selectByPage1(condition, pageNum, 20)
      .then(resp => {
        pageInfo.value = resp.data;
      });
}

//跳转到商品详情页
function toGoodsView(id) {
  router.push({
    path: '/user/goods',
    query: {
      id
    }
  });
}

watch(goodsStore, () => {
  search()
});
getParent();
</script>

<style scoped>
.category ul li {
  float: left;
  margin: 10px 20px;
  font-size: 14px;
  cursor: pointer;
}

.active {
  color: var(--theme-color);
  font-weight: bold;
}

.goodsList ul li {
  width: 224px;
  float: left;
  margin-right: 20px;
  text-align: center;
  background-color: #EEE;
  margin-bottom: 20px;
  cursor: pointer;
}

.goodsList ul li:hover {
  box-shadow: 0px 0px 20px #000;
}

.goodsList ul li:nth-child(5n) {
  margin-right: 0px;
}

.name, .dscp, .price {
  line-height: 25px;
}

.name {
  font-size: 16px;
  font-weight: bold;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
</style>